Other
Scientific paper
Oct 2003
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003esasp.539..575s&link_type=abstract
In: Proceedings of the Conference on Towards Other Earths: DARWIN/TPF and the Search for Extrasolar Terrestrial Planets, 22-25 A
Other
Space Missions, Darwin, Extrasolar Planets
Scientific paper
The current DARWIN design is based on six telescopes located on free-flying spacecraft, interferometrically combined on a central hub with free space propagation. Perfect mechanical stability of the system configuration is impossible, i.e. displacements, thermal effects and vibrations etc. are degrading the system performance. The purpose of the fringe sensor is to measure all relevant perturbations and to provide the necessary information to achieve co-phasing of the free-flying telescopes. This implies the measurement of differential piston/tip/tilt between the telescopes and selected higher-order aberrations on each pupil. The fringe sensor is thus a core component and the most critical real-time sensor in the DARWIN system. The goal of the current study is to identify and validate a high-precision fringe detection and tracking sensor called DWARF (DARWIN Astronomical Fringe Sensor) by setting up, characterising and testing a respective sensor breadboard. This paper summarises the requirements and the technological trade-off and describes the conceptual breadboard design and testing scheme. Another paper of this conference 'DARWIN Fringe Sensor (DWARF) Concept Study' by F. Cassaing et al. describes the concept selection.
Barillot Marc
Baron Fabien
Cassaing Frédéric
Hofer Stefan
Mugnier Laurent
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